Hi,
I found this memory leak on xen-4.5.0:
linux-byXjTX:~ # virsh version
Compiled against library: libvirt 1.2.17
Using library: libvirt 1.2.17
Using API: Xen 1.2.17
Running hypervisor: Xen 4.5.0
Steps to produce this leak:
1.
Start a vm, win7_64_2U_vhd, for example.
2.
Stop libvirtd and start it with valgrind, using the following command:
valgrind --tool=memcheck --log-file=xs.log --leak-check=full --show-reachable=yes --track-origins=yes --trace-children=yes --verbose libvirtd -d –l
3.
Wait until libvirtd started, then reboot the vm:
virsh reboot win7_64_2U_vhd
4.
After vm restarted, kill valgind with signal 3:
kill -3 27483 (27483 is the pid of valgrind)
5.
Open xs.log, search ‘definitely’, we will always find this leak:
==28989== 40 bytes in 1 blocks are definitely lost in loss record 327 of 585
==28989== at 0x4C27B9B: malloc (vg_replace_malloc.c:263)
==28989== by 0x7EBD618: read_message (xs.c:1146)
==28989== by 0x7EBE8C6: read_thread (xs.c:1222)
==28989== by 0x74F8805: start_thread (in /lib64/libpthread-2.11.3.so)
==28989== by 0x77EC66C: clone (in /lib64/libc-2.11.3.so)
When we reboot vm twice, this leak would happen twice either. Could anyone verify this and fix it?
VM XML config attached here, just for reference:
<domain type='xen'>
<name>win7_64_2U_vhd</name>
<memory>2097152</memory>
<currentMemory>2097152</currentMemory>
<vcpu>2</vcpu>
<hotplug vcpu='disable'/>
<on_poweroff>destroy</on_poweroff>
<on_reboot>restart</on_reboot>
<on_crash>destroy</on_crash>
<viridian>1</viridian>
<rtc_timeoffset>3600</rtc_timeoffset>
<clock offset='utc'/>
<keymap>en-us</keymap>
<os>
<type>hvm</type>
<loader>/usr/lib/xen/boot/hvmloader</loader>
<boot dev='hd'/>
</os>
<devices>
<emulator>/usr/lib/xen/bin/qemu-system-i386 </emulator>
<disk type='file' device='disk'>
<driver name='file'/>
<source file='/sdb/sgd/win7_64_2U_vhd'/>
<target dev='xvda' bus='xen'/>
</disk>
<disk type='file' device='cdrom'>
<driver name='file'/>
<source file='/usr/bin/pvdriver_upgrade/null.iso'/>
<target dev='xvdd'/>
<readonly/>
</disk>
<graphics type='vnc' listen='0.0.0.0'/>
<video>
<model type='cirrus' vram='8092'/>
</video>
</devices>
</domain>
